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Iron deficiency anemia  causing blue skin under the eyes. If there is a shortage of iron in the body, oxygen cannot be properly transported by the blood. Hemoglobin is the oxygen transporting component in the blood, moving oxygen from the lungs to the cells where it is released for normal cell metabolism.
Genetics are the biggest culprit. If you inherit fair or thin skin under the eyes, itâs more obvious when blood pools there (often because of slower circulation from lack of sleep). This accumulation causes fragile capillaries to stretch and leak. Age is another factor. Over time, skin loses collagen and thins, so veins show through more prominently.